declination of the needle的意思|示意

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磁偏角

磁针偏角 ... 磁针 magnetic needle 磁针偏角 declination of the needle 磁针倾角 dip of needle ...

磁针倾角 ... declination needle 磁偏指针 declination of the needle 磁针倾角 declination of zenith 天顶赤纬 ...